OPTIONS

Options marked with (*) can be prefixed with a ’no’, e.g. ’-nohamif’.
All options can be abbreviated to their shortest unique prefix.
-maxplanes | -mpn
(default 5, minimum 1, maximum 16) Maximum planes to write in a
normal ILBM. If the pixmap does not fit into <n> planes, ppm-
toilbm writes a HAM file (if -hamif is used), a 24bit file (if
-24if is used) or a direct color file (if -dcif is used) or
aborts with an error.
-fixplanes | -fpb
(min 1, max 16) If a normal ILBM is written, it will have
exactly <n> planes.
-hambits | -hamplanesn
(default 6, min 3, max 16) Select number of planes for HAM pic-
ture. The current Amiga hardware supports 6 and 8 planes, so
for now you should only use this values.
-normal
Turns off -hamif/-24if/-dcif, -hamforce/-24force/-dcforce and
-cmaponly. Also sets compression type to byterun1.
This is the default.
-hamif (*)
-24if (*)
-dcif (*)
Write a HAM/24bit/direct color file if the image does not fit
into <maxplanes> planes.
-hamforce (*)
-24force (*)
-dcforce (*)
Write a HAM/24bit/direct color file.
-dcbits | -dcplanesrgb
(default 5, min 1, max 16). Select number of bits for red,
green & blue in a direct color ILBM.
-ecs Shortcut for: -hamplanes 6 -maxplanes 5
This is the default.
-aga Shortcut for: -hamplanes8-maxplanes8-ham6 Shortcut for: -hamplanes6-hamforce-ham8 Shortcut for: -hamplanes8-hamforce-compress (*)
This is the default. Compress the BODY chunk. The default com-
pression method is byterun1. Compression requires building the
ILBM image in memory; turning compression off allows stream-
writing of the image, but the resulting file will usually be 30%
to 50% larger. Another alternative is the -savemem option, this
will keep memory requirements for compression at a minimum, but
is very slow.
-cmethodnone|byterun1
This option does the same thing as -compress.
-mapppmfile
Write a normal ILBM using the colors in <ppmfile> as the col-
ormap. The colormap file also determines the number of planes,
a -maxplanes or -fixplanes option is ignored.
-cmaponly
Write a colormap file: only BMHD and CMAP chunks, no BODY chunk,
nPlanes = 0.
-savemem
See the -compress option.

LIMITATIONS

HAM pictures will always get a grayscale colormap; a real color selec-
tion algorithm might give better results. On the other hand, this
allows row-by-row operation on HAM images, and all HAM images of the
same depth (no. of planes) share a common colormap, which is useful for
building HAM animations.